H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/24 (2006.01) H04B 7/005 (2006.01) H04Q 7/28 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2108324
A Communications System. Abstract. Fig. 1 illustrates a communications system (10) covering a plurality of cells (11, 12). The system comprises a controller (13), for administering control of the system, and a plurality of communications devices (A-J) each having a transceiver for transmitting request messages to and receiving control messages from the controller (13). The communications devices (A- J) comprise registered communication devices that are registered with the controller (13) as being associated with a talk group and scanning communication device receptive to at least one talk group. The controller has a data base containing information relating registered communication devices to a current cell in which they are located, a receiver responsive to the request messages and a transmitter for transmitting control messages. The controller (13) allocates voice channels to cells participating in a talk group call. When a talk group request message is received by the controller, a first control message (OSW) is transmitted to cells containing registered communications devices associated with the talk group. The first control message assigns a voice channel for the talk group in the cell. A second control message (TGCA OSW) is transmitted to all other cells indicating that the talk group call has been established for the talk group.
Gowling Lafleur Henderson Llp
Motorola Israel Limited
LandOfFree
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